Here I am again… Two questions to start with, some will read these and think I am as dumb as a box of rocks …..
1. What is the relationship of the Target Line to the Line of Flight from the perspective of a line on the ground? In TGM- both of these would be exactly the same. The Definition would be located in 2-E 4th paragraph, first sentence. Anotherwords, it is the direction the ball is headed milliseconds after it leaves the face of the club- but just in the horizontal sense- as you say "that line on the ground", ignoring loft. That is before Venturi forces take affect. Anotherwords, the direction your clubface is facing at separation.
2. What is the relationship of the Plane Line to the Line of Flight from the perspective of a line on the ground? (edited - Plane Line the same or not as Flight Line was the intent of the question being asked) Generally speaking, If your hitting a straight shot- they are the same. If you're fading/slicing the Plane line is left of the flight line. If you're drawing/hooking the Plane line is right of the flight line.
3. What is the relationship of the Plane Line to the Target Line from the perspective of a line on the ground? (edited - Plane Line the same or not as Target Line was the intent of the question being asked) See 1&2 above.
TGM references would be appreciated. 2-E 4th paragraph first sentence.
2-D-0 3rd paragraph, first and second sentence.
7-5 All (But especially important is the 2nd paragraph, 2nd sentence.
10-5 All (But especially the 1st paragraph)
Two final points-
1) There are obviously many other areas in the book that touch on this subject. For example, 2-F 3rd paragraph last sentence- refers to it and although he didn't spell it out- it's referencing a straight shot (saying the Plane line is usually the line of flight).
2) You probably can get more detailed/nitpicky etc- in regards to "Plane Line", low point? Impact?, etc, etc. And if you're intent is to dwelve deeper- all of those maybe areas of interest.
Rather than prejudice anyones response, I will refrain from providing mine. No tricks here, this is an honest attempt hoping to lift some fog and get a solid handle on this...
I overlooked 2-E. I came to the same conclusion even though in TGM the Line of Flight and Target Line seem to be intermixed such as it is in 7-5 and 10-5. The description of 'intended' line of flight is what got me searching. Why the switch between Line of Flight to Target Line was the concern. I did look up what is in some of the golf dictionaries and discovered that Target Line was only mentioned once or twice in context to the intended line of flight or line of flight. Most just defined it as a straight line between the ball and end point, the target (hole, etc.)
Interesting your response to the Plane Line question saying it is the same in some cases, but the references refer to it as parallel. Just as the Stance Line is parallel. That indicates that though the Line is the same it is parallel, meaning a different line as represented in 10-5 photos.
I was waiting for Ted to post, he PMed me saying he was going to. Then I was going to post my research with the TGM references and conclusions. Come on Ted.